Colloidal Synthesis and Characterization of Molybdenum Chalcogenide Quantum Dots Using a Two-Source Precursor Pathway for Photovoltaic Applications

Abstract

The drawbacks of utilizing nonrenewable energy have quickened innovative work on practical sustainable power sources (photovoltaics) because of their provision of a better-preserved decent environment which is free from natural contamination and commotion. Herein, the synthesis, characterization, and application of Mo chalcogenide nanoparticles (NP) as alternative sources in the absorber layer of QDSSCs is discussed. The successful synthesis of the NP was confirmed as the results from the diffractive peaks obtained from XRD which were positive and agreed in comparison with the standard. The diffractive peaks were shown in the planes (100), (002), (100), and (105) for the MoS ₂ nanoparticles; (002), (100), (103), and (110) for the MoSe ₂ nanoparticles; and (0002), (0004), (103), as well as (0006) for the MoTe ₂ nanoparticles. MoSe ₂ presented the smallest size of the nanoparticles, followed by MoTe ₂ and, lastly, by MoS ₂. These results agreed with the results obtained using SEM analysis. For the optical properties of the nanoparticles, UV–Vis and PL were used. The shift of the peaks from the red shift (600 nm) to the blue shift (270–275 nm and 287–289 nm (UV–Vis)) confirmed that the nanoparticles were quantum-confined. The application of the MoX ₂ NPs in QDSSCs was performed, with MoSe ₂ presenting the greatest PCE of 7.86%, followed by MoTe ₂ (6.93%) and, lastly, by MoS ₂, with the PCE of 6.05%.